Which of the Following,when Added to an Equilibrium Mixture Represented

Which of the following,when added to an equilibrium mixture represented by the equlibrium below,will not alter the composition of the original equilibrium mixture?
Mg(OH) ₂(s)
Mg²⁺(aq) + 2OH^-(aq)

A) Addition of Mg(NO₃) ₂(s) to the equilibrium mixture.
B) Addition of Fe(NO₃) ₃(aq) from the equilibrium mixture.
C) Addition of Mg(OH) ₂(s) to the equilibrium mixture.
D) Addition of HCl(aq) to the equilibrium mixture.
E) Addition of NaOH(s) to the equilibrium mixture.